F22 on a Sunsynk ECCO single-phase hybrid SG05LP1: Emergency stop / remote shutdown
Short answer
On a Sunsynk inverter, F22 means: Emergency stop / remote shutdown. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Emergency stop / remote shutdown.
Part involved: emergency stop / remote control.
When it shows: Emergency stop or remote shutdown command.
Likely causes:
- Emergency stop button triggered or inverter remotely shut down.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: Clear the emergency stop / remote shutdown.
What you can check
- Read the full code and message on the inverter screen or in the Sunsynk Connect app and note the date/time for your installer.
- Check the inverter's AC isolator next to the inverter and the solar/battery breaker in the consumer unit are ON (do not reset a breaker that trips again - call your installer).
- Ask whether anyone (installer, supplier or app user) shut the inverter down remotely.
What the engineer will check
- Check emergency-stop input wiring and remote control settings.
Who to ask for: Qualified electrician / MCS PV installer.
Certification: Firmware/config change via installer portal; no special certification but installer access normally required.
What you might notice
Sources
- Fault Codes Causes & Solutions Version 1.0 ↗ · Version 1.0 · page 6 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026